Thanks for the list! I will add them to our blocklist :) Our business values e-mail destinations where we can actually incite the signed up user with interesting offers, or new product features, instead of sending it into a black hole.
If I give you a blackhole e-mail address, it's because I suspect you are going to spam me. Blocking the blackhole addresses only alienates me as a customer, confirms my suspicion that you intend to spam me and adds one more barrier to my trying your software or service.
It seems like you should recognize that a user does not want interesting offers when they submit a black hole address to you. Or maybe that's what you're saying you do?
By removing customer's choice to use a blackhole email, I suspect you are much more likely to lose them as a customer, rather than gain a happy customer with a valid email.
If they do go the latter route and give you a real email address, it is really so valuable to you? More likely, your interesting offers will get tagged with the "spam" flag, or auto-deleted by a filter.
What happens in that case is people just type in RandomDictionaryWord at majoremailprovider.com and then the person who really is at that address gets the pleasure of your interesting offers, even though that person probably never heard of you.
(My old gmail account gets Pizza Hut order confirmations from some guy in Texas. About every other week.)
